@article{Zaichko2014methodological,
author={Zaichko, V.. and Zhiganov, A.. and Maksimov, A..},
title={Methodological approach to the cosmic products and services classification },
journal={Services in Russia and abroad},
publisher={Russian State University of Tourism and Service},
year={2014},
pages={176-187},
volume={8},
issue={4},
}